Saw-tooth-swaging device



i 2 sheets-sheet 1.

S. A. PARKE.

SAW TOOTH SWAGING DEVICE.

Patented Jan. 5, 1886.

@aims (No Model.) y 2 sheets-sheet 2.

S. A. PARKE.

l SAW TOOTH SWAGINGDEVICE. l

No. 333,540. V Patented Jan. 5, 1886.

UNITED STATES PATENT OEEICEG SARAH A. PARKE, OF BAY CITY, MICHIGAN.

SAW-TOOTH-SWAGING DEVICE.

SPECIFICATION forming part. of Letters Patent No. 333,540, dated January5, 1886.

Application filed November 19,1885. Serial No. 183,287. (No model.)

.To a/ZZ whom 7125 may concern.-

Be it known that I, SARAH A. PARKE, a citizen of thel United States,residing at Bay City, in the county of Bay and State of Michigan, haveinvented certain new and useful Improvements in Saw-Swages; and I dohereby declare the following to be a full, clear, and eX- actdescription of the invention, such as will enable others skilled in theart to whichit appertains to make and use the same, reference being hadto the accompanying drawings, and to the letters and figures ofreference marked thereon,which form a part ofthis speeiiication.

My invention relates to improvements in devices for swaging the teeth ofsaws; and it consists, first, in a die block or holder of peculiarconstruction; second, in a rotary die having a die-face of a new andimproved form; third, a guide for properly adjusting the device upon thesaw,and a clamping device forholding the die-block in asuitable positionfor swaging the tooth, and in an adjustable anvil upon which the toothis held while being swaged; and the object of my invention is to providean easier and more effectual means of swaging the saw-teeth than hasbeen heretofore in use. I attain these objects by means of the devicesillustrated in the accompanying drawings, in which- Figure 1 is a sideView of my improved saW-swaging machine as applied to a straight saw.Fig. 2 is the same as applied for swaging a circular saw, partlysectional. Fig. 3 isa longitudinal vertical section of Fig. l. Fig. 4 isa section at x Fig. 5 is a section at QJ ya represents a swage-bloek ofany desired form, square being shown for convenience, having alongitudinal slot, b, in its lower portion, the upper portion of theslot being of such form as to allow the teeth of the saw to be placedwithin the slot in a suitable manner tobeswaged.Athreadedopeningisarranged through the solid portions e on each side ofthe slot b, and opposite each other, through which are passed thescrew-threaded clamping-bolts c and d, the bolt c being provided with ahead, f, upon its outer end,with which to adjust the bolt, and on itsinner end with a serrated face, which bears against the sawtooth withinthe slot, and the opposite clamping-bolt,d,is provided with aplain faceon its inner end,and with a head upon its outer end, upon which isplaced a lever, g, with which to turn the bolt, so that when thesaw-tooth is placed in a proper position within the slot b the clamp cis adj usted to bear against one side of the tooth when it is midwaybetween the sides of the slot, and is held in that position by a piece,It, provided with an opening, i, which is passed over the head f, andhas its opposite end secured to the block a by a screw, j. Theclamping-bolt d is then turned by the lever g to bear heavily againstthe saw-tooth, which will then be securely held for swaging. A shaft, Z,which forms a rotary die,is passed into the block a in a position justabove the open slot b, and a-portion of the upper part ofthe slot is cutaway to allow a saw-tooth to pass properly over the die, and at a pointjust opposite the slot b a die-face is formed by cutting out a portionof the shaft Z near the inner end thereof, forming a flattenedsurfaee,n,upon the upper portion ofthe die-face,and the lower edge isslightly rounded, and upon the ends of this rounded edge are thedepressed parts 0 and o', and also adepression.p,is formed midwaybetween the parts o and o', leaving the higher portions r and r betweenthe central and'outside depressions.

I form the die-face near the inner end of the shaft l, in order to avoidthe tendency of the shaft to break, as the die-face is of necessity madevery hard, and when the shaft is eX- tended entirely through the block athe length of the shaft is so great that it is liable to spring whenbeing hardened, and this causes the shaft to break when worked heavilyupon the saw-tooth, whereas by forming the die-face near the end of theshaft only a short portion is required to be hardened, and the liabilityof springing the shaft is greatly reduced. The shaft Z is also supportedby a solid portion, w, of the swage-block under the shaftZ and over theslot b, which receives the pressure of the shaft when the operation ofswaging is going on. The shaftl is held in position by an extended part,j', of the piece h, which engages with a groove, t', in the shaft.Directly over the die-face is placed an anvil, m, formed by fitting theinner end of a screwlOO threaded bolt to a proper formas fiat orlevel-and hardening the same, the bolt being passed in a diagonaldirection through the solid portion of the block a above the die Z, andin a position such as to bring the face of the inner end thereof toconform very nearly to the plane of the upper side of the saw-tooth toVbe swaged, a further and more accurate adj ustment being accomplished bytilting the swageblock a in the required direction, and the outer end ofthe bolt is finished with a square head, m', with which to turn the sameand adjust the anvil-face to the proper distance from the die-face. Theanvil-face being adj usted to a position close to the die will cause thetooth to be spread out just at the point, while leaving a small spacebetween the die and anvil allows the saw-tooth to be placed farther uponthe die, and the die then acts upon the tooth farther from the point andspreads the tooth wider, giving a greater clearance to the saw.

The action of this form of dieeface is, that when the parts are properlyadj usted the sawtooth is placed with its forward or cutting edge uponthe dat or level part n of the dieface, and with its back or oppositeedge bearing against the face of the anvil m, and is rigidly secured inthat position by the clampingscrew (Z. The shaft Z is then rotated,rolling the dieface toward the point or cutting-edge of the tooth, andthe rounded portion of the die-face presses into the tooth, drawing thepoint forward, and at the same time the raised parts r and r' pressingdeeper into the tooth causes the material displaced by the dieface tospread out at the sides of the tooth, leaving a full or rounded portionin the central portion of the swaged tooth formed by the depression p inthe central part of the die-face.

The advantage gained by using this form of die-face is that the tooth isspread out with greater ease and rapidity, and the depression p avoidsthe liability of splitting the tooth, which sometimes occurs when thedepression 1) is not formed in the face. tached to the back part of theswage-block a by a screw, t, which passes through a slot, u, in theupper end of the guide s and into the block. The outward-extending arm sof the guide is provided on its end with the downward-extending parts o,between which the saw is held, while the pointof one or more of theteeth rest against the under side of the arm s', and the guide beingadjustable by means of the slot a and bolt t, the block may be tilted inthe proper position for swaging a straight saw, as a gang or band saw,so that when the guide is adjusted to bear upon the point of the tooth,as described, and the swage is moved to the next tooth, the swage-blockwill rest in the same position as it occupied upon the former toot-h,making the points of the teeth uniform.

For adjusting the swage -block upon a circular saw, a guide, c', is usedinstead of the guide s, and consists of a body, b, secured by the boltsc to the back part of the block a, and is provided with anoutward-extended part, cZ, through which is arranged a threaded open- Aguide, s, is ating, e', and a threaded bolt, f, is passed upward throughthis opening e', the head of the boltf being upon its lower end andadapted to rest upon the top ofthe saw-tooth next to the one beingswag-ed, and is properly adjusted to bring the swage-block in a properposition by turning the boltf in the proper direction for raising orlowering the rear portion of the swage-block. A stop, g', is secured tothe side of the block @,which extends forward and then outward to reachsomewhat beyond the lever lc when the lever is thrown over to bring thedieface in position to act upon the tooth; and a similar stop, h, issecured to the upper corner of the block aand extended in an oppositedirection from the stop g, and adapted to stop the lever when it ismoved to the proper distance for swaging the tooth.

Having described the construction and operation of my invention, what Iclaim as new, and desire to secure by Letters Patent, is-

l. In a saw-swage, a rotary die having a dieface formed by cutting awaya portion of the cylindrical die, forming a flattened portion, u, withthe side depressions, o and o', and the central depression, p, in oneedge of the said portion n, forming the raised parts r between the saiddepressions, substantially as and for the purpose set forth.

2. In a saw-swage, the swage-block a, provided with a longitudinal slotin its lower portion, a shaft, Z, passed into the block and providedwith a die-face opposite the slot, and a clamping device adapted to holdthe saw within the said slot, in combination with a screw threaded boltpassed into the swage block above the die-face, and with its inner endforming an anvil, against which one edge of a sawtooth rests while thedie acts upon its opposite edge, substantially as and for the purposeset forth.

3. In a saw-swage, the combination,with the swage-block a, having thelongitudinal slot b, of a shaft, Z, havinga die-face formed thereon, thescrew-threaded anvil m above the die-face, and the clamping-bolts @andcZ, passed through opposite sides of the block and extending into thesaid slot, substantially as and for the purpose set forth.

4. In saW-swage, the combination of the block a, a shaft, Z, passed intothe block and provided with a die-face, and a lever, la, on the outerend of the shaft, with the stopping devices g and h, substantially asand for the purpose herein described.

5. In a saw-swage, the swage-block a, the shaft Z, having a die-face,the anvil m, secured above the dic-face, and clamping-bolts c and d, incombination with the piece la, secured to the swage block, and providedwith an extended part having an opening, z', passed over the head vf ofthe clamping-bolt c, substantially as and for the purpose set forth.

6. In a saw-swage, the swage-blocl: a, the shaft Z, having a die-faceformed thereon, the anvil m, passed through the block above thedie-face, and the clamping-bolts c and d, in

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combination with the guide s, secured to the hold the shaft Z inposition, substantially as Io block by the bolt t, and provided with theset forth and shown.

slot u and the outward-extending arm s', sub- In testimony whereof I axmy signature in stantially as and for the purpose set forth. presence oftwo witnesses.

7. In a saw-swewe the swage-block a the shaft Z, provided with adie-face and having a SARAH A PARKE' groove, i, in combination with apiece, h, se- Witnesses: cured to the block, and with an extended por-J. E. THOMAS,

tion, j,Withn the said groove and adapted to l ANNA BLAKE.l

